Potential fixes in parse_xml_v4_file.py

[sjsf00]

In the original file from 2005 to 2012, the information of inventors tree is like:
 

<applicants>
<applicant sequence="001" app-type="applicant-inventor" designation="us-only">
<addressbook>
<last-name>Davis</last-name>
<first-name>Shawn P.</first-name>
<address>
<city>Jefferson Hills</city>
<state>PA</state>
<country>US</country>
</address>
</addressbook>
<nationality>
<country>omitted</country>
</nationality>
<residence>
<country>US</country>
</residence>
</applicant>
<applicant sequence="002" app-type="applicant-inventor" designation="us-only">
<addressbook>
<last-name>Garbin</last-name>
<first-name>Kelly</first-name>
<address>
<city>St. Louis</city>
<state>MO</state>
<country>US</country>
</address>
</addressbook>
<nationality>
<country>omitted</country>
</nationality>
<residence>
<country>US</country>
</residence>
</applicant>
<applicant sequence="003" app-type="applicant-inventor" designation="us-only">
<addressbook>
<last-name>Russell</last-name>
<first-name>Wellington Kelvin</first-name>
<address>
<city>Houston</city>
<state>TX</state>
<country>US</country>
</address>
</addressbook>
<nationality>
<country>omitted</country>
</nationality>
<residence>
<country>US</country>
</residence>
</applicant>
</applicants>

I think the branch should be like: ~/applicants/applicant or ~/applicants to parse multiple inventor info

But in parse_xml_v4_file.py, both old and new branch are wrote like:

line49: us_parties_inventors_path = f'{us_parties_base_path}/inventors/inventor'
line52: us_parties_inventors_path_old = f'{us_parties_base_path_old}/inventors/inventor'

Using the code to parse data from 2005 to 2012 with data_items:['INVT'], it supposed to return the inventors info, but it returns None.

Furthermore, I am not pretty sure if the parser parsing correctly when there are multiple inventors, I think it may needs to be f'{us_parties_base_path}/inventors' for that type of case(mostly).